Cisco 12406 Installation And Configuration Manual page 45

Chapter 1 Product Overview
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The GRP memory options and instructions for upgrading memory are described
Note
in the Cisco 12000 Series Gigabit Switch Router Memory Replacement
Instructions (Document Number 78-4338-xx).
The Cisco IOS software images for operating the router reside in Flash memory
on the GRP. The Flash memory can be either the single in-line memory module
(SIMM) on the GRP or a PCMCIA Flash memory card that inserts into either
PCMCIA slot 0 or slot 1 (labeled SLOT-0 and SLOT-1) on the front of the GRP.
(See
The GRP Flash memory SIMM contains the Cisco IOS software boot image, and
Note
a PCMCIA Flash memory card contains the Cisco IOS software image.
Storing the Cisco IOS images in Flash memory enables you to download and boot
from upgraded Cisco IOS images remotely or from software images resident in
GRP Flash memory. The Cisco IOS software runs from within GRP DRAM.
OL-11497-03
GRP route memory configurations of 512 MB are compatible with
Note
only Product Number GRP-B=. Cisco IOS Release 12.0(19)S or
12.0(19)ST or later, and ROMMON Release 11.2 (181) or later are
also required.
SRAM—512 kilobytes (KB) of static random-access memory (SRAM) for
secondary CPU cache memory functions. SRAM is not user configurable or
field upgradeable.
NVRAM—512 KB of nonvolatile RAM (NVRAM). NVRAM is not user
configurable or field upgradeable.
Memory—Most of the additional memory components used by the system,
including onboard Flash memory and up to two Personal Computer Memory
Card International Association (PCMCIA)-based Flash memory cards and
Advanced Technology Attachment (ATA) Flash disks.
The GRP is shipped with 20 MB of Flash memory as the default
configuration.
Sensors—Air-temperature sensors for environmental monitoring.
Figure 1-5.)
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
Route Processors
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